1. Using Subtraction to solve one step word problems
Lesson 15
Using Subtraction to solve one step word problems

2. Lesson Objective After this lesson you will be able to:
Use the standard subtraction algorithm to solve one step word problems.
You will also be using your place value understanding to decompose numbers smaller units to solve one step word problems.

3. Let’s Start with a Problem
When the amusement park opened, the number on the counter at the gate read 928,614. 
At the end of the day, the counter read 931,682. 
How many people went through the gate that day?

4. Problem # 1
When the amusement park opened, the number on the counter at the gate read 928,614. 
At the end of the day, the counter read 931,682. 
How many people went through the gate that day?
What do I need to solve for? What do I know?

5. Problem # 1
When the amusement park opened, the number on the counter at the gate read 928,614. 
At the end of the day, the counter read 931,682. 
How many people went through the gate that day?
What do I need to solve for? What do I know?

6. It’s time to create our handy dandy…
Problem # 1
It’s time to create our handy dandy…

7. It’s time to create our handy dandy… NOTEBOOK!
Problem # 1
It’s time to create our handy dandy…
NOTEBOOK!

8. It’s time to create our handy dandy… NOTEBOOK! Just kidding. : )
Problem # 1
It’s time to create our handy dandy…
NOTEBOOK!
Just kidding. : )
We need to create a tape diagram.

9. Problem # 1
Where do our numbers 928,614 and 931,682 go?

10. Problem # 1
931,682
928,614 P

11. Problem # 1 Now it’s time to set-up our subtraction problem. 931,682
928,614 P
Now it’s time to set-up our subtraction problem.

12. Problem # 1
Are we ready to subtract?
931,682
,614

13. - 928,614 931,682 Problem # 1 Are we ready to subtract?
Remember to check if we need to regroup.
931,682
,614

14. Problem # 1
Let’s go ahead and regroup now.
931,682
,614

15. Problem # 1
Let’s go ahead and regroup now.
Are we ready to subtract? 2 11 7 12
931,682
,614

16. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614 8

17. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614 68

18. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614
068

19. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614
3,068

20. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614
03,068

21. Problem # 1
Remember to start with the ones and work our way up. 2 11 7 12
931,682
928,614
003,068

22. Problem # 1
So our final answer is 3,068 people. 2 11 7 12
931,682
928,614
3,068

23. Let’s Try One More Problem
Last year, there were 620,073 people in attendance at a local parade. 
This year, there were 456,795 people in attendance.  
How many more people were in attendance last year?

24. Let’s Try One More Problem
Last year, there were 620,073 people in attendance at a local parade. 
This year, there were 456,795 people in attendance.  
How many more people were in attendance last year?
With a partner create a tape diagram for this problem.

25. Problem # 2
Did your partner and you get…

26. Problem # 2 Did your partner and you get this or something similar?
620,073
Last year
This year
456,795 A

27. Problem # 2
Now it’s time for you to solve this subtraction problem on your own…
620, ,795

28. Problem # 2
Did you get…
620, ,795

29. Problem # 2
Did you get… 11 9 9 16 5 12 10 10 17 13
620, ,795

30. Problem # 2
Did you get… 11 9 9 16 5 12 10 10 17 13
620, ,795
163,278

31. Great Job! All right now it is your turn!
Complete the 3 Problems on page 82